CN111741296A - Method for detecting video channel frequency of Unicable tuner and set top box - Google Patents
Method for detecting video channel frequency of Unicable tuner and set top box Download PDFInfo
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- CN111741296A CN111741296A CN202010629888.0A CN202010629888A CN111741296A CN 111741296 A CN111741296 A CN 111741296A CN 202010629888 A CN202010629888 A CN 202010629888A CN 111741296 A CN111741296 A CN 111741296A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/4424—Monitoring of the internal components or processes of the client device, e.g. CPU or memory load, processing speed, timer, counter or percentage of the hard disk space used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
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- General Health & Medical Sciences (AREA)
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- Circuits Of Receivers In General (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention provides a method for detecting the frequency of a video channel of a Unicable tuner, which comprises the steps of detecting and obtaining a list with center frequencies corresponding to all the video channels one by one when an opening command is sent and the tuner opens all the video channels, detecting and obtaining a list with the center frequencies corresponding to the rest video channels one by one after one video channel is closed again when a closing command is sent and the tuner closes one video channel, comparing the lists of the previous time and the next time to obtain the center frequency corresponding to the closed video channel, and repeating the steps to obtain the center frequencies of all the video channels. Correspondingly, the invention also provides a set top box with the function of detecting the frequency of the video channel of the Unicable tuner, and the method is implemented on the set top box by operating the set top box, so that the method has the characteristics of simplicity and quickness, and the convenience in installation and use is improved.
Description
Technical Field
The invention belongs to the technical field of set top boxes, and particularly relates to a method for detecting the frequency of a video channel of a Unicable tuner and a set top box.
Background
The satellite broadcast digital television system has the characteristics of wide coverage, large program capacity and the like, and the DVB-S standard is almost adopted by all satellite broadcast digital television systems. The signal transmission mode of the DVB-S standard determines that a user has higher difficulty in installing a set top box, and the user needs to align a signal receiving device to a satellite to be received, so that a little deviation cannot occur.
The Unicable tuner is a device used by a set-top box for receiving signals and demodulating video information, can move frequency spectrum to any position of 950MHz-2150MHz, realizes propagation of signals of any combination of high and low local oscillators and horizontal and vertical on the same coaxial line, and means that multiple pieces of frequency point information can be transmitted on one coaxial line at the same time without mutual interference.
Even if the Unicable tuner can meet the requirement of using one signal line for multiple users at the same time, the Unicable tuner complies with the EN50494 protocol, users need to set the allocated video channel number and the intermediate frequency corresponding to the video channel when using, each user can allocate a video channel number and the intermediate frequency corresponding to the video channel in advance, and the users do not allow to change the intermediate frequency corresponding to the video channel. When a user needs to watch a program, the user needs to set the video channel number of the user and the intermediate frequency corresponding to the video channel, the user cannot watch the program if the intermediate frequency does not correspond to the video channel number, only when the user sets the program correctly, the user can watch the program normally, and the Unicable tuner can support the simultaneous use of eight users without mutual interference.
However, in the installation and use process, the center frequencies of all video channels of the Unicable tuner need to be known, and at present, no simple and quick method and set-top box can realize the function.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for detecting the video channel frequency of a Unicable tuner and a set top box, which can simply and quickly detect the central frequencies of all video channels in the Unicable tuner and improve the convenience of installation and use.
The invention provides a method for detecting the video channel frequency of a Unicable tuner, which comprises the following steps:
step S1, sending an opening command to a high-frequency tuner, wherein the opening command is used for enabling the high-frequency tuner to open all video channels, and the number of the video channels is at least two;
step S2, detecting the first signal output by the video channel to obtain the center frequency corresponding to the video channel one by one;
step S3, sending a closing command to a high-frequency tuner, wherein the closing command is used for enabling the high-frequency tuner to close a video channel;
step S4, repeating step S2, and comparing the two center frequency lists to obtain the center frequency corresponding to the closed video channel;
step S5, repeat step S3 and step S4.
Further, in step S2, the following steps are included:
step S201, setting internal parameters;
step S202, analyzing a first signal output by the video channel to obtain a first processing result;
step S203, processing the first processing result to obtain a second processing result, where the second processing result includes the center frequency and the bandwidth of the video channel in one-to-one correspondence.
Further, setting a detection frequency range is included in step S201.
Further, the detection frequency range is set to be 950MHz-2150 MHz.
Further, the step S201 further includes adjusting the AGC voltage.
Further, in step S203, the FFT algorithm is used to map the first processing result from the time domain to the frequency domain, and the second processing result is analyzed from the frequency domain according to the inherent characteristics of the center frequency spectrum.
Further, the open command is an ODU _ ubxsignal _ ON command in the Unicable standard.
Further, the shutdown command is an ODU _ PowerOFF command in the Unicable standard.
The invention also provides a set top box with a function of detecting the frequency of the video channel of the Unicable tuner, which comprises the following components:
the tuner comprises a turning-on module, a switching-on module and a control module, wherein the turning-on module is used for sending a turning-on command to a high-frequency tuner, and the turning-on command is used for enabling the high-frequency tuner to turn on all video channels;
the detection module is used for detecting the first signals output by the video channels to obtain the center frequencies corresponding to the video channels one to one;
a shutdown module to send a shutdown command to a tuner, the shutdown command to cause the tuner to shut down a video channel.
The invention has the beneficial effects that:
the invention provides a method for detecting the frequency of a video channel of a Unicable tuner, which comprises the steps of detecting and obtaining a list with center frequencies corresponding to all the video channels one by one when an opening command is sent and the tuner opens all the video channels, detecting and obtaining a list with the center frequencies corresponding to the rest video channels one by one after one video channel is closed again when a closing command is sent and the tuner closes one video channel, comparing the lists of the previous time and the next time to obtain the center frequency corresponding to the closed video channel, and repeating the steps to obtain the center frequencies of all the video channels.
Correspondingly, the invention also provides a set top box with the function of detecting the frequency of the video channel of the Unicable tuner, and the method is implemented on the set top box by operating the set top box, so that the method has the characteristics of simplicity and quickness, and the convenience in installation and use is improved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a logic block diagram of a method for detecting the frequency of a video channel of a Unicable tuner according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1:
referring to fig. 1, embodiment 1 provides a method for detecting a frequency of a video channel of a Unicable tuner, including:
step S1, sending an opening command to a high-frequency tuner, wherein the opening command is used for enabling the high-frequency tuner to open all video channels, and the number of the video channels is eight;
step S2, detecting the first signal output by the video channel to obtain the center frequency corresponding to the video channel one by one;
step S3, sending a closing command to a high-frequency tuner, wherein the closing command is used for enabling the high-frequency tuner to close a video channel;
step S4, repeating step S2, and comparing the two center frequency lists to obtain the center frequency corresponding to the closed video channel;
step S5, repeat step S3 and step S4.
It should be noted that when an open command is sent and the tuner opens all the video channels, a list with center frequencies corresponding to all the video channels one to one is detected and obtained, the list includes center frequencies F1 to F8, when a close command is sent and the tuner closes one video channel, a list with center frequencies corresponding to the remaining video channels one to one after closing one video channel is detected and obtained again, at this time, the list includes center frequencies F1 to F7, the lost frequency obtained by comparing the two previous and next lists is F8, the center frequency F8 corresponding to the closed video channel can be obtained, and so on, the center frequencies of all the video channels are obtained. Wherein, because of complying with the EN50494 protocol, the open command is an ODU _ ubxsignal _ ON command in the unified standard, and the close command is an ODU _ PowerOFF command in the unified standard.
In the present embodiment, more specifically, in step S2, the following steps are included:
step S201, setting internal parameters, including setting a detection frequency range and adjusting AGC voltage;
step S202, analyzing a first signal output by the video channel to obtain a first processing result;
step S203, processing the first processing result to obtain a second processing result, where the second processing result includes the center frequency and the bandwidth of the video channel in one-to-one correspondence.
In step S2, the detection frequency range is set to 950MHz-2150MHz, which is consistent with the frequency range of the Unicable tuner, so as to facilitate subsequent detection; the AGC voltage is adjusted to make the visible range of the frequency spectrum larger, so that the subsequent signal processing is convenient, and because the amplitude difference of the frequency spectrum of the video channel of each Unicable lnb manufacturer is not large and is limited in a limited range, the AGC voltage is adjusted only in a very small range; the method comprises the steps of analyzing a first signal output by a video channel to obtain a first processing result, wherein the first processing result comprises a central frequency signal, but the signal is not accurate and needs to be processed, filtering the first processing result in step S203, removing useless frequency spectrum to obtain a suspected signal frequency spectrum, mapping the suspected signal frequency spectrum to a frequency domain from a time domain by adopting an FFT algorithm, analyzing a second processing result from a frequency domain range according to the inherent characteristics of the central frequency spectrum, and the second processing result comprises the central frequency and the bandwidth which are in one-to-one correspondence with the video channel. By the method, the center frequency and the bandwidth corresponding to the video channels one to one can be obtained when the first signal output by the video channels is detected each time.
Example 2:
embodiment 2 provides a set top box with a function of detecting a video channel frequency of a Unicable tuner, including:
the tuner comprises a turning-on module, a switching-on module and a control module, wherein the turning-on module is used for sending a turning-on command to a high-frequency tuner, and the turning-on command is used for enabling the high-frequency tuner to turn on all video channels;
the detection module is used for detecting the first signals output by the video channels to obtain the center frequencies corresponding to the video channels one to one;
a shutdown module to send a shutdown command to a tuner, the shutdown command to cause the tuner to shut down a video channel.
It should be noted that, a user operates the set top box, sends an ODU _ ubxsignal _ ON command to the tuner through the opening module of the set top box, so that the tuner opens all video channels, obtains the center frequencies of the video channels in one-to-one correspondence by using the detection module, sends an ODU _ PowerOFF command to the tuner through the closing module, so that the tuner closes one video channel, obtains the center frequencies of the remaining closed video channels in one-to-one correspondence by using the detection module, and obtains the center frequencies corresponding to the closed video channels by comparing the detection results twice. Additionally, in this embodiment, one Unicable tuner is correspondingly connected to eight set-top boxes, each set-top box has a video channel number and an intermediate frequency corresponding to the video channel that are allocated in advance, and any one set-top box can obtain the center frequency of the video channel of the Unicable tuner after performing the above operations.
Compared with the prior art, the invention provides a method for detecting the frequency of a video channel of a Unicable tuner, which comprises the steps of detecting and obtaining a list with center frequencies corresponding to all the video channels one by one when an opening command is sent and the tuner opens all the video channels, detecting and obtaining a list of the center frequencies corresponding to the remaining video channels one by one after one video channel is closed again when a closing command is sent and the tuner closes one video channel, comparing the lists of the previous time and the next time to obtain the center frequencies corresponding to the closed video channels, and so on to obtain the center frequencies of all the video channels.
Correspondingly, the invention also provides a set top box with the function of detecting the frequency of the video channel of the Unicable tuner, and the method is implemented on the set top box by operating the set top box, so that the method has the characteristics of simplicity and quickness, and the convenience in installation and use is improved.
Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, but only the preferred embodiments of the invention have been described above, and the present invention is not limited to the above-described embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for detecting the frequency of a video channel of a Unicable tuner is characterized by comprising the following steps:
step S1, sending an opening command to a high-frequency tuner, wherein the opening command is used for enabling the high-frequency tuner to open all video channels, and the number of the video channels is at least two;
step S2, detecting the first signal output by the video channel to obtain the center frequency corresponding to the video channel one by one;
step S3, sending a closing command to a high-frequency tuner, wherein the closing command is used for enabling the high-frequency tuner to close a video channel;
step S4, repeating step S2, and comparing the two center frequency lists to obtain the center frequency corresponding to the closed video channel;
step S5, repeat step S3 and step S4.
2. The method for detecting the frequency of the video channel of the Unicable tuner of claim 1, wherein in step S2, the method comprises the following steps:
step S201, setting internal parameters;
step S202, analyzing a first signal output by the video channel to obtain a first processing result;
step S203, processing the first processing result to obtain a second processing result, where the second processing result includes the center frequency and the bandwidth of the video channel in one-to-one correspondence.
3. The method according to claim 2, wherein step S201 includes setting a detection frequency range.
4. The method for detecting the frequency of the video channel of the Unicable tuner as claimed in claim 3, wherein the detection frequency is set to be in the range of 950MHz to 2150 MHz.
5. The method according to claim 3, further comprising adjusting the AGC voltage in step S201.
6. The method as claimed in claim 2, wherein in step S203, the FFT algorithm is used to map the first processing result from time domain to frequency domain, and the second processing result is analyzed from the frequency domain according to the inherent characteristics of the center frequency spectrum.
7. The method according to claim 1, wherein the open command is an ODU _ ubxsignal _ ON command in the Unicable standard.
8. The method according to claim 1, wherein the shutdown command is an ODU _ PowerOFF command in the unified standard.
9. A set top box with a function of detecting the frequency of a video channel of a Unicable tuner is characterized by comprising the following components:
the tuner comprises a turning-on module, a switching-on module and a control module, wherein the turning-on module is used for sending a turning-on command to a high-frequency tuner, and the turning-on command is used for enabling the high-frequency tuner to turn on all video channels;
the detection module is used for detecting the first signals output by the video channels to obtain the center frequencies corresponding to the video channels one to one;
a shutdown module to send a shutdown command to a tuner, the shutdown command to cause the tuner to shut down a video channel.
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| CN202010629888.0A CN111741296A (en) | 2020-07-03 | 2020-07-03 | Method for detecting video channel frequency of Unicable tuner and set top box |
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| CN202010629888.0A CN111741296A (en) | 2020-07-03 | 2020-07-03 | Method for detecting video channel frequency of Unicable tuner and set top box |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510460A (en) * | 2011-11-21 | 2012-06-20 | 深圳市同洲电子股份有限公司 | Digital television satellite receiver and user band (UB) installation method thereof |
| CN202565387U (en) * | 2012-03-16 | 2012-11-28 | 广西广播电视技术中心 | Multi-path intelligent television signal receiver |
| CN103858365A (en) * | 2011-04-16 | 2014-06-11 | 熵敏通讯公司 | Single-cable automatic IRD installation procedure |
| WO2014115609A1 (en) * | 2013-01-25 | 2014-07-31 | ソニー株式会社 | Signal processing device, signal processing method, and program |
| US20150113573A1 (en) * | 2013-10-21 | 2015-04-23 | Advanced Digital Broadcast S.A | System and method for conflict recognition on diseqc protocol |
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2020
- 2020-07-03 CN CN202010629888.0A patent/CN111741296A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103858365A (en) * | 2011-04-16 | 2014-06-11 | 熵敏通讯公司 | Single-cable automatic IRD installation procedure |
| CN102510460A (en) * | 2011-11-21 | 2012-06-20 | 深圳市同洲电子股份有限公司 | Digital television satellite receiver and user band (UB) installation method thereof |
| CN202565387U (en) * | 2012-03-16 | 2012-11-28 | 广西广播电视技术中心 | Multi-path intelligent television signal receiver |
| WO2014115609A1 (en) * | 2013-01-25 | 2014-07-31 | ソニー株式会社 | Signal processing device, signal processing method, and program |
| US20150113573A1 (en) * | 2013-10-21 | 2015-04-23 | Advanced Digital Broadcast S.A | System and method for conflict recognition on diseqc protocol |
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